JP2004209464A - Spray machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spray machine by which time and labor loaded on a worker are reduced. <P>SOLUTION: The spray machine 1 is provided with a machine body 4 supported by wheels 2 to travel on a farm field. The machine body 4 is provided with a spray part 6 connected to an independent pump through a liquid feed hose 5 and spraying a liquid forcibly sent by the pump, a driving part 7 driving the wheels 2, a crutch 8 for switching on/off the transmission of power of the driving part 7 to the wheels 2 and a detecting part 9 for detecting the boundary of the spraying zone in the farm field and cut-off the crutch 8. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a sprayer for spraying a liquid such as a drug solution, a liquid fertilizer, and water on a field.

  An example of this type of conventional sprayer is an unmanned watering vehicle 80 disclosed in Patent Document 1. The unmanned watering vehicle 80 has a watering portion 82 provided on a vehicle body frame, which is connected to a water supply hose 81 via a watering valve 81a. The water sprinkling section 82 is provided with a water sprinkling pipe 83 which rotates by the reaction of the water sprinkling while sprinkling water from the tip end, and a wire winding section 85 which winds and operates a wire 84 around the water sprinkling pipe 83 is interlocked and connected. I have. Then, a base end of the wire 84 is connected to a winding drum 86 provided in the wire winding section 85, and a stopper body 87 is attached to a tip side of the wire 84. Further, a detection body 89 for detecting the stopper body 87 is provided on the body frame 88, and an interlocking mechanism 90 is provided between the detection body 89 and the watering valve 81a. And the closing operation of the watering valve 81a are linked.

JP-A-8-205698

  However, since the unmanned watering vehicle 80 is configured to run by the reaction force of winding the wire 84, the wire 84 is pulled out from the wire winding portion 85 of the unmanned watering vehicle 80 at the starting point before each run. However, it is necessary to connect the wire 84 to the pile 91 erected at the terminal point of the unmanned watering vehicle 80, which is troublesome. In addition, when working alone, it is necessary to return to the starting point and start the unmanned watering vehicle 80 again after connecting the wires at the terminal point, which is a further problem.

  Also, in order to water the entire field, it is necessary to make the unmanned water sprinkler 80 travel a number of times in the field, but since the unmanned water sprinkler 80 only stops when it reaches the end point, the worker has to manually There is a problem that it is necessary to return to the starting point, and a great deal of labor is required.

  An object of the present invention is to solve the above-described problems and to provide a sprayer that can reduce labor and labor of an operator.

  In order to achieve the above object, the sprayer of the present invention includes an airframe supported on wheels so as to be able to travel in a field, and the airframe is connected to a separate pump via a liquid supply hose, and A spraying unit for spraying the liquid being pumped, a driving unit for driving the wheels, a clutch for turning on and off the transmission of the power of the driving unit to the wheels, and detecting a boundary of a spraying range in the field. A detection unit for disengaging the clutch is provided.

  With this configuration, when the boundary is detected, the transmission of the power of the driving unit to the wheels is stopped by the clutch and stopped, and the aircraft is allowed to travel back and forth. For example, the sprayer in a field At the start point, the sprayer can be pulled back to the start point by drawing the liquid supply hose (a wire, a chain, or the like previously connected to the machine body). Therefore, the operator can reciprocate the sprayer from the starting point to the boundary while staying at the starting point.

  Further, a sprayer is provided by separately providing a tank for storing liquid, a pump for sucking liquid from the tank and pumping the liquid to a liquid supply hose, a reel for winding the liquid supply hose, and the like. Since it is small and lightweight, it is possible to make small turns and reduce labor for changing ridges.

Although the mode in which the detection unit detects the boundary is not particularly limited, the following modes are exemplified.
(1) A mode in which the boundary is detected by touching an object to be detected set at the boundary.
(2) An aspect configured to detect the boundary by detecting the object to be detected set at the boundary in a non-contact manner. As a mode of detecting by non-contact, known non-contact detecting means can be appropriately adopted and is not particularly limited, but a mode of detecting a magnetic force generated by a magnet attached to an object to be detected is exemplified.

  The object to be detected is not particularly limited, but examples include a pile, a fence, a wall, a net, a rope, and the like.

  The detection unit exemplifies an aspect configured to stop the driving source of the driving unit when detecting the boundary.

  Although the drive source of the drive unit is not particularly limited, a prime mover such as an engine or an electric motor is exemplified.

  With this configuration, when the boundary is reached, the driving unit is automatically stopped, and it is possible to prevent the energy source from being wasted.

  The detection unit exemplifies an aspect configured to stop spraying the liquid when detecting the boundary.

  With this configuration, when the boundary is reached, the spraying of the liquid is automatically stopped, and it is possible to prevent the liquid from being wasted.

  The detection unit exemplifies a mode including a display unit that displays that the boundary has been detected so that it can be recognized from a distance.

  With this configuration, for example, the fact that the sprayer has detected the boundary provided at the terminal point in the field can be recognized from the starting point of the sprayer. Therefore, it is possible to start pulling back the sprayer after confirming that the boundary has been detected, that is, that the clutch has been disengaged. The display mode of the display unit is not particularly limited, but a display object (display plate, display tower, or the like) hidden from the field of view of the worker may be displayed in the field of view of the worker, or may be displayed in the field of view of the worker. A mode in which a certain display object is hidden from the field of view of an operator, a mode in which the display object is conspicuous (lighting, blinking, or the like is started), a mode in which the display object is inconspicuous (lighting, blinking, or the like is stopped), or the like. Is exemplified.

  ADVANTAGE OF THE INVENTION According to the sprayer which concerns on this invention, the outstanding effect that the labor and labor of an operator can be reduced is produced.

  1 to 6 show a sprayer according to a first embodiment of the present invention. The sprayer 1 includes a machine body 4 supported by four front and rear, left and right wheels 2 so as to be able to travel between ridges on both sides of a ridge U in a field. The body 4 includes a spraying unit 6 for spraying a liquid pressure-fed from a separate dynamic injection device 70 connected via a liquid supply hose 5, a driving unit 7 for driving the wheels 2, and a driving unit 7. And a detection unit 9 that disconnects the clutch 8 by detecting the end of the ridge U as a boundary of the spraying area in the field.

  The dynamic spraying device 70 used in combination with the sprayer 1 of the present embodiment is not particularly limited. In the present embodiment, as shown in FIGS. 5 and 6, a liquid is supplied from a separate tank 74 via a suction hose 75. The pump unit 71 is provided with a pump unit 71 that sucks in and feeds the solution to the liquid supply hose 5, and a liquid supply hose winding reel 73 rotatably supported by the machine body 72. Further, the dynamic injection device 70 has a function of allowing the liquid supply hose 5 to be pulled out from the reel 73 and winding the liquid supply hose 5 around the reel 73. Further, the dynamic injection device 70 may have a wireless or wired remote control function.

  The body 4 includes, as shown in FIGS. 1 to 3, a pair of left and right side frames 11 extending in the front-rear direction, and a pair of front and rear horizontal frames 12 connecting the left and right side frames 11. The pair of side frames 11 are connected to each other by a pair of front and rear connecting members 11a whose substantially central portions in the front and rear direction extend left and right. Front legs 13 extending downward are provided at both ends of the front horizontal frame 12, respectively, and wheels 2 are provided at the lower ends of the front legs 13 so as to be rotatable and non-turnable. Similarly, rear legs 14 extending downward are provided at both ends of the rear horizontal frame 12, respectively. The wheels 2 are rotatable at the lower ends of the rear legs 14 and cannot rotate in the direction. It is provided in. Each front leg 13 is provided with a wheel cover 13a which mainly covers the front so that the wheel 2 does not damage the crop, and each rear leg 14 is provided with a wheel cover 14a which mainly covers the rear of the wheel 2. Have been. The front and rear wheel covers 13a and 14a are connected to each other by a connection frame 18 extending in the front and rear direction. Each horizontal frame 12 includes a horizontal frame main body 15 formed of a rectangular cylindrical body, and a slide frame 17 that is slidably inserted into cylindrical holes on both sides of the horizontal frame main body 15 and fixed in position by fixing bolts 16. The distance between the left and right wheels 2 can be adjusted according to the width of the ridge U by adjusting the fixed position of each slide frame 17 with respect to the horizontal frame main body 15. Further, a substantially U-shaped handle 19 in plan view is attached to the rear ends of the pair of side frames 11, and the handle 19 has a throttle lever 21 for controlling a rotation speed of an engine 30, which will be described later, Various operation means such as a detection start lever 22 for setting a detection unit 9 to be described later in a detectable state are provided.

  The spraying unit 6 includes a folding boom 25 extending to the left and right provided at the tip of the body 4 and a plurality of booms attached to the boom 25 at substantially constant intervals in the boom length direction and connected to the liquid supply hose 5. And a nozzle 26. The boom 25 includes a center boom section 25a supported at the tip of the body 4 and side boom sections 25b supported on both sides of the center boom section 25a so as to be foldable rearward of the body 4. Both side boom portions 25b are held in a state where they are extended left and right (see FIG. 3) or a state where they are folded (see FIGS. 1 and 2) by urging means 27 (a tension spring in this example). When it is folded rearward, it is supported by a boom holder 28 erected at the rear of the body 4.

  The drive unit 7 includes an engine 30 as a motor supported by the connecting member 11a of the body 4, a reduction transmission 31 connected to the engine 30 via a centrifugal clutch 37 (see FIG. 3), and a clutch 8 And a power transmission mechanism 32 connected thereto. In the drive unit 7, the part where the clutch 8 is provided may be any part as long as the body 4 can travel back and forth when the clutch 8 is disengaged, and is not limited to the part shown in this example.

  The power transmission mechanism 32 will be described. The mechanism includes a transmission shaft 33 rotatably supported by the body 4 and extending left and right, and rotation of the output shaft of the clutch 8 is controlled by a first transmission element 34 (in this example). The transmission is transmitted to the transmission shaft 33 via a chain transmission mechanism). The rotation of the transmission shaft 33 is transmitted to both front axles 3 by second transmission elements 35 (belt transmission mechanisms in this example) provided at both ends. Further, the rotation of the front axles 3 is transmitted to the rear axles 3 by a third transmission element 36 (a belt transmission mechanism in this example). Thus, the four wheels 2 are driven by the engine 30. The reason why the belt transmission mechanism is mainly used to drive the axle 3 is exemplified here because the belt transmission has a small reduction in transmission efficiency when sand or soil adheres to the field. The transmission shaft 33 is configured to expand and contract in accordance with the adjustment of the left and right wheel intervals by the horizontal frame 12.

  The detection unit 9 includes a pair of vertical frames 40 erected at the front ends of the pair of side frames 11, a pair of support frames 41 protruding forward from the upper ends of the respective vertical frames 40, A detection frame 43 of a substantially rectangular shape as viewed from the front, which is supported at a front end portion of the frame 41 via a rotation shaft 42 in a front-rear rotatable and front-down state, and one (left side in this example) of the support frame 41 is rotated back and forth. A pivot lever 44 (see FIG. 4) movably supported at the center by a shaft 44a.

  The detection frame 43 is configured such that the left and right side frame portions 43a can adjust the length thereof, whereby the lower frame portion 43b of the detection frame 43 can be adjusted according to the height of the detection target and the height of the crop. The height can be adjusted appropriately. Further, both side frame portions 43a of the detection frame 43 have protrusions 52 and 53 extending above the rotation shaft 42, respectively, and one (left side in this example) of the protrusion 52 is provided with an urging means 48 (this example). , And the other (right side in this example) projection 53 is connected to the clutch 8 by a wire 49 (see FIG. 3).

  The rotary lever 44 has an elongated hole 45 formed at one end (lower side in this example) of the rotary lever 44 so as to extend substantially in the length direction of the lever and to bend substantially forward at the rotation center side. A pin 46 projecting below the rotary shaft 42 of the detection frame 43 is fitted into the elongated hole 45. The one end of the rotating lever 44 is urged rearward by an urging means 47 (a tension spring in this example), and the other end is connected to the throttle lever 21 and the detection start lever 22 by wires 50 and 51, respectively. They are connected (see FIG. 3).

  The operation of the detection unit 9 will be described. First, FIG. 4A shows a state where the detection unit 9 can detect. In this state, the fuselage 4 moves forward, and the lower portion of the detection frame 43 contacts an object to be detected such as a stake, and the lower portion is pushed backward relative to the fuselage 4. While rotating backward, the pin 46 protruding from the detection frame 43 moves upward along the long hole 45 of the rotating lever 44. When the pin 46 reaches the bent portion of the elongated hole 45, the rotating lever 44 biased by the biasing means 47 rotates as shown in FIG. The long hole 45 enters the bent portion and is locked there. As a result, the detection frame 43 is held in a detection end state in which the detection frame 43 is pushed rearward relative to the body 4. At this time, the wire 50 connected to the other end of the rotating lever 44 is pushed backward, whereby the throttle lever 21 connected to the wire 50 is pushed back, the rotation speed of the engine 30 decreases, and the centrifugal clutch 37 runs out. At the same time, the wire 49 connected to the protruding portion 53 of the detection frame 43 is also pushed backward, whereby the clutch 8 connected to the wire 49 is disengaged, and the machine body 4 becomes free to move forward and backward. To return the detection unit 9 from the detection end state to the detectable state, the detection start lever 22 may be gripped. Then, since the wire 51 connected to the detection start lever 22 is pulled backward, the other end of the rotating lever 44 connected to the wire 51 is pulled backward. As a result, the rotation lever 44 rotates, and the pin 46 protruding from the detection frame 43 comes out of the bent portion and returns to the detectable state.

  Next, an operation example of the sprayer 1 in combination with the dynamic injection device 70 will be described. Here, in this example, it is assumed that a chemical solution is sprayed on the crop C grown on the ridge U, one end in the length direction of the ridge U is set as a starting point, the other end is set as a boundary of a spray range, and the other end is covered with a coating. It is assumed that a stake 55 as a detection object is set up in advance. In order to operate the sprayer 1, first, the dynamic injection device 70 is brought into a state where the liquid supply hose 5 can be pulled out from the reel 73 thereof. Then, the sprayer 1 is arranged at the departure point of the ridge U, and the detection start lever 22 is pulled to make the detection unit 9 detectable. In this state, the pump unit 71 of the dynamic injection device 70 is started, the engine 30 of the sprayer 1 is started, and the throttle lever 21 is operated to appropriately set the rotation speed of the engine 30. Then, the centrifugal clutch 37 is engaged according to the rotation speed of the engine 30, and the sprayer 1 sprays the chemical solution on the crop C (see the two-dot chain line in FIG. The vehicle travels along U toward the other end of the ridge U. Thereafter, as shown in FIGS. 5 and 6B, when the detection frame 43 comes into contact with the pile 55, the detection unit 9 operates as described above, and the throttle lever 21 is pushed back, so that the rotation speed of the engine 30 decreases. Then, the centrifugal clutch 37 is disengaged, and the clutch 8 is disengaged, so that the machine body 4 is free to run back and forth. In this state, when the pump unit 71 of the dynamic injection device 70 is stopped and the function of winding the liquid supply hose 5 is activated, as shown in FIG. Is drawn towards the starting point. When the sprayer 1 is pulled to the starting point, the function of the dynamic injection device 70 for winding the liquid supply hose 5 is stopped. Thus, the spraying operation for one ridge U is completed. Then, the sprayer 1 is moved to another ridge (the ridge is changed), and the above-described steps are repeated to spray the chemical solution in a desired range in the field.

  According to the sprayer 1 of the present invention configured as described above, when the boundary of the spray range is detected, the transmission of the power of the drive unit 7 to the wheels 2 is stopped by the clutch 8 and the machine body 4 is moved back and forth. The sprayer 1 can be pulled back to the starting point by drawing the liquid supply hose 5 at the starting point of the sprayer 1 in the field by making the vehicle run freely. Therefore, the operator can reciprocate the sprayer 1 from the starting point to the boundary while staying at the starting point.

  In addition, since the sprayer 1 is reduced in size and weight by providing the tank 74 and the dynamic injection device 70 separately from the body 4 without providing the same, the turnability is reduced and the labor for changing ridges can be reduced. it can.

  Next, FIG. 8 shows a sprayer 100 according to a second embodiment of the present invention. The sprayer 100 differs from the first embodiment mainly in that the configurations of the body 103 and the power transmission mechanism 104 are changed, and that the display unit 102 is provided in the detection unit 101. Therefore, the same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.

  The body 103 of the present example includes a frame 110 formed in a rectangular shape, and the horizontal frame 12 attached to substantially the center of the frame 110 in the front-rear direction and extending left and right. Leg portions 111 are provided at both ends of the horizontal frame 12, respectively. Each leg 111 is formed by connecting a pair of left and right frames 111a formed in a substantially triangular shape (a substantially equilateral triangular shape in this example) when viewed from the side. Are mounted so as to be slidable in the left-right direction, and are fixed in position by fixing bolts 113. By adjusting the fixed position of the leg 111, the distance between the left and right wheels 2 can be adjusted. The front and rear wheels 2 are attached to the front and rear vertexes of the lower side of the triangular shape of the leg 111, respectively, so as to be rotatable and non-turnable. A pair of right and left handles 19 are attached to the rear end of the frame 110.

  As described above, according to the airframe 103 of the present embodiment, since the left and right four wheels 2 are supported by one horizontal frame 12, the number of parts can be reduced and the cost can be reduced. Further, when adjusting the distance between the left and right wheels 2, it is only necessary to adjust the mounting position of the leg 111 with respect to one horizontal frame 12, and the adjustment is easy.

  In the power transmission mechanism 104 of the present example, both ends of the transmission shaft 33 are rotatably supported by a support column 112 erected at the upper apex of the triangular shape of the leg 111. The driving force of the transmission shaft 33 is transmitted to the front and rear wheels 2 via a chain transmission mechanism 115 as a second transmission element on both sides of the body 103. The chain transmission mechanism 115 is wound around the sprocket 33a attached to the end of the transmission shaft 33, the sprockets 3a attached to the axle 3 of the front and rear wheels 2, and the three sprockets 33a 3a 3a. And a chain 116. Then, the rotation of the output shaft of the clutch 8 is transmitted to the transmission shaft 33 via the first transmission element 34 (in this example, a chain transmission mechanism). The rotation of the transmission shaft 33 is transmitted to the axles 3 of the front and rear wheels 2 by the second transmission elements 35 provided at both ends. Thus, the four wheels 2 are driven by the engine 30. The second transmission element of the main chain is provided with a cover 117 so that sand and soil in the field do not adhere to the chain 116. The transmission shaft 33 is configured to expand and contract in accordance with the adjustment of the interval between the left and right wheels 2 by the horizontal frame 12, as in the first embodiment.

  According to the power transmission mechanism 104 of this example, since the driving force of the transmission shaft 33 is transmitted to the front and rear wheels 2 by one chain transmission mechanism 115 for each of the left and right, the number of parts is smaller than that of the first embodiment. And cost can be reduced.

  The detection unit 101 of the present example includes a pair of base frames 120 erected at the front end of the frame frame 110, and a vertical frame 40 supported to be vertically adjustable relative to the base frame 120, A rotary handle 122 for adjusting the vertical position of the vertical frame 40 with respect to the base frame 120, a pair of support frames 41 protruding forward from the upper end of each vertical frame 40, and a front end of the support frame 41 A detection frame 123 having an inverted T-shape in front view, which is rotatable back and forth via a rotation shaft 42 and supported in a forward-downward state, and is supported rotatably back and forth by one (left side in this example) support frame 41. And a display unit 102 for displaying that the boundary has been detected so that it can be recognized from a distance.

  The detection frame 123 has a vertically extending vertical frame portion 123a whose length can be adjusted, whereby the lower frame portion 123b of the detection frame 123 can be adjusted according to the height of the detected object and the height of the crop. Height can be adjusted appropriately. The rotating shaft 42 has a first projection 52 projecting rearward at one end (left end in this example) and a second projection 53 projecting upward at the other end (right end in this example). The two projections 52 and 53 are configured to rotate with the rotation of the detection frame. The first protrusion 52 is urged obliquely downward and rearward by an urging means 48 (a tension spring in this example). The second protruding portion 53 is connected to the clutch 8 by a wire 49, and a locking portion 53a for locking a second rotating lever 130 of the display portion 102 described later is protruded to the side.

  The display unit 102 includes a second rotation lever 130 whose center is supported by a shaft 131 so as to be able to rotate back and forth on one (the right side in this example) of the support frame 41. An arm 132 extending in the length direction of the lever is protruded from one end of the second rotating lever 130, and a display plate 133 is attached to a tip of the arm 132. The second rotary lever 130 is configured to rotate between a state in which the arm 132 is tilted forward (FIG. 11) and a state in which the arm 132 is upright (FIG. 12). The other end of the second rotating lever 130 is urged by a spring 134 as an urging means in a direction in which the arm 132 stands. The rear surface of the display plate 133 in a state where the arm 132 stands up is colored in a color (for example, red, yellow, or the like) that stands out from the surroundings. Note that the display panel 133 in a state where the arm 132 is standing up may be configured to emit light or blink.

  The use of the display unit 102 will be described. In a detectable state (FIG. 11), one end of the second rotating lever 130 is locked by the locking portion 53 a of the second protrusion 53. Then, when the lower portion of the detection frame 123 comes into contact with the object to be detected and the lower portion is pushed rearward relative to the body 103, the detection frame 123 and the second protrusion 53 rotate accordingly. Going, and in the detection end state (FIG. 12), one end of the second rotating lever 130 is disengaged from the locking portion 53 a of the second protrusion 53. Then, the arm 132 urged by the spring 134 stands up, and the display board 133 is displayed so that the detection of the boundary can be recognized from a distance. As described above, when the boundary is detected, the display unit 102 causes the display board 133 hidden from the view of the worker to appear in the view of the worker.

  According to the detection unit 101 of the present example, since the display unit 102 is provided, for example, the worker detects from the departure point of the sprayer 100 that the sprayer 100 has detected the boundary provided at the terminal point in the field. Can be recognized. Therefore, after confirming that the boundary has been detected, that is, that the clutch 8 has been disengaged, the operator can start pulling back the sprayer 100.

  According to the sprayer 100 of the present embodiment, in addition to the same effects as those of the sprayer of the first embodiment, the above-described effects unique to the present embodiment can be obtained.

Note that the present invention is not limited to the above-described embodiment, and may be embodied with appropriate modifications without departing from the spirit of the invention, for example, as described below.
(1) The detection unit may be configured to detect an object installed at a boundary of the spray range without contact, thereby detecting the boundary. As an example of the non-contact detection, a mode of detecting a magnetic force generated by a magnet attached to an object to be detected is exemplified.
(2) The worker takes up the liquid supply hose 5 with a manual reel.

(3) When the detection unit 9 detects the boundary of the spray range, the engine 30 of the drive unit 7 is stopped. Thereby, it is possible to prevent the fuel of the engine 30 from being wasted.
(4) The liquid supply to the nozzle 26 is stopped when the detection unit 9 detects an object to be detected. The mode for stopping the liquid supply is not particularly limited. However, a valve is provided between the liquid supply hose 5 and the nozzle 26, and the valve is controlled to be closed. A mode in which control is performed so as to stop the control will be described. Thereby, when the boundary of the spray range is reached, the spraying of the liquid is automatically stopped, and the liquid can be prevented from being wasted.

FIG. 2 is a side view of the sprayer according to the first embodiment of the present invention. It is a front view of the sprayer. It is a top view of the sprayer. It is a side view which shows the principal part of the detection part of the same sprayer, (a) is a figure which shows a detectable state, (b) is a figure which shows a detection end state. It is a side view which shows operation | movement of the sprayer. It is a top view which shows a series of operation | movement of the sprayer. It is a top view which shows the unmanned watering vehicle as a conventional sprayer. It is a left view of the sprayer concerning a 2nd embodiment of the present invention. It is a top view of the sprayer. It is a rear view which shows the structure of the leg part and the power transmission mechanism of the sprayer. It is a right view which shows the principal part of the detection part in the detection possible state of the said sprayer. It is a right view which shows the principal part of the detection part in the detection end state of the said sprayer. It is a rear view which shows the principal part of a detection part in the detection end state of the said sprayer.

Explanation of reference numerals

REFERENCE SIGNS LIST 1 sprayer 2 wheels 4 body 5 supply hose 6 spraying unit 7 drive unit 8 clutch 9 detection unit 26 nozzle 43 detection frame 55 pile 70 dynamic injection device 71 pump unit 73 reel 74 tank 100 sprayer 101 detection unit 102 display unit 103 Aircraft 104 Power transmission mechanism C crop U ridge

Claims (5)

Equipped with a body supported on wheels so that it can run on the field,
A spray unit connected to a separate pump via a liquid supply hose for spraying liquid pumped by the pump; a driving unit for driving the wheels; and the wheels for driving the driving unit. A sprayer provided with a clutch for turning on and off the transmission to the field, and a detecting unit for detecting a boundary of a spray range in the field and disengaging the clutch.   2. The sprayer according to claim 1, wherein the detection unit is configured to detect the boundary by coming into contact with an object installed at the boundary. 3.   The sprayer according to claim 1, wherein the detection unit is configured to stop a driving source of the driving unit when detecting the boundary.   The sprayer according to any one of claims 1 to 3, wherein the detection unit is configured to stop spraying the liquid when detecting the boundary.   The sprayer according to any one of claims 1 to 4, wherein the detection unit includes a display unit that displays the detection of the boundary so that the boundary can be recognized from a distance.

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